If the backstop is omitted from the Withdrawal Agreement the Irish border will simply become a British bargaining chip in the future trade relationships - "give us what we want or else". Don't forget that the the majority of the British electorate (and the Brexiters en masse) care not one jot about Ireland, north or south, unionist or nationalist.
This is the one and only chance to get a border guarantee.
Agreed.
I think it will be politically impossible for any Irish government to erect any kind of infrastructure in the event of a no-deal.